Apparently using a high volume on headphones can seriously damage your hearing over long periods of time. This is discussed on Wikipedia. Nonetheless, my habit is to turn up the volume up and forget to turn it down. For this reason I created some profiles which will:

a) turn the media volume down to 2 and resume the track I was listening to when I plug in my headphones Download
b) turn the volume down by 1 every 10 minutes whenever headphones are plugged in, if the volume is higher than 2 Download
c) Unrelated to the volume issue I also have a profile which will automatically launch a menu of common music applications when I plug in the headphones Download